Compared abilities of filled and unfilled natural rubbers to crystallize in a large strain rate domain

2015 ◽  
Vol 108 ◽  
pp. 9-15 ◽  
Author(s):  
Nicolas Candau ◽  
Laurent Chazeau ◽  
Jean-Marc Chenal ◽  
Catherine Gauthier ◽  
Etienne Munch
Keyword(s):  
Strain Rate ◽  
Large Strain ◽  
Large Strain Rate

scholarly journals A Modified Eyring Equation for Modeling Yield and Flow Stresses of Metals at Strain Rates Ranging from 10−5to 5 × 104 s−1

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Ramzi Othman
Keyword(s):  
Constitutive Equation ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Large Strain ◽  
Rate Sensitivity ◽  
Industrial Applications ◽  
Strain Rate Range ◽  
Strain Rates ◽  
Wide Range ◽  
Large Strain Rate

In several industrial applications, metallic structures are facing impact loads. Therefore, there is an important need for developing constitutive equations which take into account the strain rate sensitivity of their mechanical properties. The Johnson-Cook equation was widely used to model the strain rate sensitivity of metals. However, it implies that the yield and flow stresses are linearly increasing in terms of the logarithm of strain rate. This is only true up to a threshold strain rate. In this work, a three-constant constitutive equation, assuming an apparent activation volume which decreases as the strain rate increases, is applied here for some metals. It is shown that this equation fits well the experimental yield and flow stresses for a very wide range of strain rates, including quasi-static, high, and very high strain rates (from 10−5to 5 × 104 s−1). This is the first time that a constitutive equation is showed to be able to fit the yield stress over a so large strain rate range while using only three material constants.

A large strain rate effect in thin free-standing Al films

2014 ◽  
Vol 90-91 ◽  
pp. 6-9 ◽  
Author(s):  
E. Ben-David ◽  
T. Tepper-Faran ◽  
D. Rittel ◽  
D. Shilo
Keyword(s):  
Strain Rate ◽  
Large Strain ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Free Standing ◽  
Large Strain Rate

scholarly journals Physically-Motivated Elasto-Visco-Plastic Model for the Large Strain-Rate Behavior of Steels

2013 ◽  
Vol 554-557 ◽  
pp. 1164-1173
Author(s):  
Jean Marc Pipard ◽  
Tudor Balan ◽  
Farid Abed-Meraim ◽  
Xavier Lemoine
Keyword(s):  
Strain Rate ◽  
Large Strain ◽  
Rate Sensitivity ◽  
Material Design ◽  
Tensile Tests ◽  
Hardening Law ◽  
Physically Based ◽  
Homogenization Approach ◽  
Large Strain Rate ◽  
Strain Rate Behavior

A physically based elasto-visco-plastic constitutive model is presented and compared to experimental results for three different mild steels. The experiments consist of tensile tests at strain rates up to 103 s-1 and reverse shear tests. The model requires significantly fewer material parameters compared to other visco-plasticity models from the literature while exhibiting very good accuracy. Accordingly, the parameter identification is simple and intuitive, requiring a relatively small set of experiments. The strain-rate sensitivity modeling is not restricted to a particular hardening law and thus provides a general framework in which advanced hardening equations can be adopted. The model was eventually used as the basis for a homogenization approach at the phase scale; preliminary investigations showed the benefit of such an approach, where microstructure-relevant data can explicitly enter the model and may be used for material design simulations.

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